If you want a better solution on OSX than you already have, try https://github.com/codekitchen/dinghy - it does a really great job of wrapping Vagrant and taking care of setting up NFS instead of the incredibly slow default vboxfs.

Alternatively I've used Parallels + NFS with Vagrant for boot2docker but it's a real pain to get set up correctly. Dinghy just did it automatically, and also set up DNS and NTP for me. Can't recommend it enough.