Enable S3FS mount of path within bucket

[ErinWeisbart]

Have not explored if this is possible.
Use case its when there are permission issues that prevent mounting of the bucket.

[ErinWeisbart]

We have since expanded functionality of downloading files and configurability of which bucket/s to use for logging/images/data. Given all that, the sis not an issue that we plan on supporting so I am closing it. It can be reopened in the future if there is a new argument to be made for it.