#============ Share Defenitions ==================

# Share open for everyone

[Allusers]
        path = /samba/allusers
        browsable = yes
        writable = yes
        guest ok = yes
        read only = no
        force user = nobody

# Share for valid users in group @smbusers

[Restricted]
        path = /samba/restricted
        valid users = @smbusers
        guest ok = no
        writable = yes
        browsable = yes


my version

/etc/samba/smb.conf

[Pictures]
    comment = My pictures
    path = /mnt/volume2/my_server/pictures
    browsable = yes
    guest ok = no
    read only = no
    create mask = 0775
    valid users = @sambashare

etc/group

sambashare:x:128:khar00f