I wish to mount my windows partition to /mnt/windows such that only users of the group 'windows' can access (or at least, write) to it.
I've specified uid=nobody,gid=windows (by number) and a umask that appears to give me the perms. I desire (upon ls -l /mnt/windows).
/dev/hda1 /mnt/windows vfat uid=nobody,gid=windows,umask=002 0 0
This will mount the directory so that all files and directories are owned by "nobody", group "windows", and permissions of 0775.