The “/Users” folder will be automatically mounted in the VM,
and the mount will be owned by a user named “docker” with
a uid number of 1000.
If you want to access files within the /Users share from your
Docker container, then you should do so as a user with uid 1000,
otherwise you will likely have permissions errors.
Fixes permission errors on OS X:
https://medium.com/@brentkearney/docker-on-mac-os-x-9793ac024e94