watcher crashes when watching a single file in repo root

[skoblenick]

Environment macOS Sierra 10.12.6 (16G29)

$ node --version
v6.10.3
$ npm --version
3.10.10

1. Code in gulpfile to reproduce:

   gulp.task('watch', function() {
       saneWatch('bower.json', {}, function() {
           gulp.start('bower');
       });
   });
   

2. Run gulp. wait about 5 seconds... gulp exits with:

   2017-09-12 13:51 gulp[35101] (FSEvents.framework) FSEventStreamStart: register_with_server: ERROR: f2d_register_rpc() => (null) (-22)
   

2017-09-12 13:51 gulp[35101] (FSEvents.framework) FSEventStreamStart: register_with_server: ERROR: f2d_register_rpc() => (null) (-22)
events.js:160
throw er; // Unhandled 'error' event
```

This issue seems to be related to fb-watchman on MacOS Sierra see facebook/react-native#9309.