[Samba] Share folder for Group users

[mampus at gmail.com]

Hi,
I create a directory that will be accessed (read &write) by some users in a
windows ADS group. This directory also is shared using samba. If users login
to samba server directly using telnet or ssh, they can do writing and
reading in this directory. But from share folder, only owner of this
directory can write, and other users in the group only can read.
hereis the directory:

drwxrwxr-x    2 andy   fileserver     4096 Dec 26 12:29 test

and this is smb.conf:

[test]
        path = /test
        writable = yes

Any ideas to make other users in the group can write also?
Thanks
Indra