[Samba] Setuid bit always set on Vista mount

[Robert Edgar]

Files on my Vista mount always have the S mode (setgid bit?) set according
to ls -l. This is a security hole and causes other problems. I can't clear
the bit with chmod; in fact the results of doing chmod don't make any sense
to me (I'll be glad to provide examples). Typical files show as -rwxrwSrwx,
though not all. The smb.conf file has create mask 0666 and directory mask
0777 various places. I inherited this smb.conf so am reluctant to mess with
it since I don't know what I'm doing.
Thanks for any advice.
Robert.