Here's an example of my fstab entry:
/dev/hda1 /c vfat defaults,uid=bigby,gid=bigby,umask=007 1 2
The umask makes the files and directories rwx for user and group, and NOT readable, writable, or executable by other. The bigby is my family group. Anyone in my family can read, write, or search/execute the files. Noone else can do a thing.