given we can't set the group.. does 775 still make sense? These end up owned by weird OSX uids (501 and dialout on my machine)..

I actually think the only reason this still works is some weirdness with the way vagrant does the NFS mounts which means all users look like the current host user.
This from my /etc/exports shows what I mean.. every user is mapped to user 501 (me)
```
"/Users/robbie/devel/Lamu" 192.168.33.110 -alldirs -mapall=501:20
```