[Samba] pdbedit -P 'maximum password age' -C 0 should be never expire?

[JustFillBug]

When I set "maximum password age" to 0, the password expired immediately
after I did a smbpasswd. Shouldn't setting to 0 mean never expire? Or
is there any other way to set password never expire?

Here's the microsoft's interpretation on 'maximum password age':

http://www.microsoft.com/technet/prodtechnol/windowsserver2003/proddocs/entserver/501.asp