Mine

[global]
  hosts allow = 129.100.
  workgroup = ITS
  security = user
  invalid users = root
  message command = /usr/ucb/mail -s 'message from %f on %m' root <%s; rm %s
  server string = ITS Samba %v
  encrypt passwords = no
; turn on extra logging
  log level = 2
  debug pid = yes
  syslog = 2
  syslog only = yes
; disable links outside of exported areas
  wide links = no

[homes]
  guest ok = no
  read only = no