The JS projects run in "development" mode, which in our case means that we use filesystem monitoring to re-build the project whenever a file change is detected. Gulp (implicitly) depends on graceful-fs . The reason I mention it is because I suspect it's related. Graceful-fs currently runs in an older version then needed (https://github.com/gulpjs/gulp/issues/1571)
I've included two samples, if that's useful, of both com.docker.hyperkit  and com.docker.osxfs . However I'm unable to upload them (being a new user and all) so I've included them as links.
My macOS Docker beta version 1.11.2-beta15 (build: 9168) 603884f1679ff0528724854e9d27fc8e67fdfd8f
 Graceful-fs - A low-level library that normalises fs calls and tries to be resilient (https://www.npmjs.com/package/graceful-fs).
 com.docker.hyperkit-sample.txt - http://pastebin.com/XhNvYmKh
 com.docker.osxfs-sample.txt - http://pastebin.com/ZC1gvQM3