[global]
    log file = /var/log/samba/log.%m
    passwd chat = *Entersnews*spassword:* %nn *Retypesnews*spassword:* %nn *passwordsupdatedssuccessfully* .
    obey pam restrictions = yes
    map to guest = bad user
    encrypt passwords = true
    passwd program = /usr/bin/passwd %u
    passdb backend = tdbsam
    dns proxy = no
    netbios name = ubsrv
    server string = ubsrv
    unix password sync = yes
    os level = 20
    syslog = 0
    usershare allow guests = yes
    panic action = /usr/share/samba/panic-action %d
    max log size = 1000
    pam password change = yes
    workgroup = workgroup

[Projects]
    valid users = @Staff
    writeable = yes
    user = @Staff
    create mode = 0777
    path = /srv/samba/Projects
    directory mode = 0777
    store dos attributes = Yes

ls -l /srv/samba/
drwxrwxrwx 2 nobody Staff 4096 2010-11-04 10:09 Projects

[someshares]
        path=/path/to/someshares
        writable = yes
        browsable = yes
        valid users = @somegroup
        create mask = 0775
        force create mode = 0775
        directory mask = 0775
        **force group = somegroup**