[Samba] Password must change - 10 days

[Beast]

When I set password lifetime to, say 90 days using 
pdbedit -P "maximum password age" -C 7776000

Attribute "Password must change" is calculated using this formula :

sambaPwdMustChange = sambaPwdLastSet + 90 days.

Is it possible to get "warning message" before actually force user to
change their password, I mean is it possible to get this formula:

sambaPwdMustChange = (sambaPwdLastSet + 90 days) - 10 days


--beast