Updating the FAQ section for supportability with NFS & FUSE filesystems.

closes fsnotify#312 fsnotify#306

README.md

@@ -10,16 +10,16 @@ go get -u golang.org/x/sys/...
 
 Cross platform: Windows, Linux, BSD and macOS.
 
-| Adapter               | OS                               | Status                                                    |
-| --------------------- | -------------------------------- | --------------------------------------------------------- |
+| Adapter               | OS                               | Status                                                                                                                          |
+| --------------------- | -------------------------------- | ------------------------------------------------------------------------------------------------------------------------------- |
 | inotify               | Linux 2.6.27 or later, Android\* | Supported [![Build Status](https://travis-ci.org/fsnotify/fsnotify.svg?branch=master)](https://travis-ci.org/fsnotify/fsnotify) |
 | kqueue                | BSD, macOS, iOS\*                | Supported [![Build Status](https://travis-ci.org/fsnotify/fsnotify.svg?branch=master)](https://travis-ci.org/fsnotify/fsnotify) |
 | ReadDirectoryChangesW | Windows                          | Supported [![Build Status](https://travis-ci.org/fsnotify/fsnotify.svg?branch=master)](https://travis-ci.org/fsnotify/fsnotify) |
-| FSEvents              | macOS                            | [Planned](https://github.com/fsnotify/fsnotify/issues/11) |
-| FEN                   | Solaris 11                       | [In Progress](https://github.com/fsnotify/fsnotify/issues/12) |
-| fanotify              | Linux 2.6.37+                    | [Planned](https://github.com/fsnotify/fsnotify/issues/114) |
-| USN Journals          | Windows                          | [Maybe](https://github.com/fsnotify/fsnotify/issues/53) |
-| Polling               | *All*                            | [Maybe](https://github.com/fsnotify/fsnotify/issues/9) |
+| FSEvents              | macOS                            | [Planned](https://github.com/fsnotify/fsnotify/issues/11)                                                                       |
+| FEN                   | Solaris 11                       | [In Progress](https://github.com/fsnotify/fsnotify/issues/12)                                                                   |
+| fanotify              | Linux 2.6.37+                    | [Planned](https://github.com/fsnotify/fsnotify/issues/114)                                                                      |
+| USN Journals          | Windows                          | [Maybe](https://github.com/fsnotify/fsnotify/issues/53)                                                                         |
+| Polling               | *All*                            | [Maybe](https://github.com/fsnotify/fsnotify/issues/9)                                                                          |
 
 \* Android and iOS are untested.
 
@@ -65,6 +65,10 @@ There are OS-specific limits as to how many watches can be created:
 * Linux: /proc/sys/fs/inotify/max_user_watches contains the limit, reaching this limit results in a "no space left on device" error.
 * BSD / OSX: sysctl variables "kern.maxfiles" and "kern.maxfilesperproc", reaching these limits results in a "too many open files" error.
 
+**Why don't notifications work with NFS filesystems or filesystem in userspace (FUSE)?**
+
+fsnotify requires support from underlying OS to work. The current NFS protocol does not provide network level support for file notifications.
+
 [#62]: https://github.com/howeyc/fsnotify/issues/62
 [#18]: https://github.com/fsnotify/fsnotify/issues/18
 [#11]: https://github.com/fsnotify/fsnotify/issues/11