Mine

  [MainShare]
  comment = All users have access
  path = /sws/publico
  guest ok = no #would it still work with "guest ok = no" ?
  read only = no
  browseable = yes
  public = yes
  writable = yes
  force create mode = 0777
  force directory mode = 0777
  create mask = 0777
  directory mask = 0777
  force user = nobody
  force group = nobody