[Samba] smb/unix password sync

[Paul Miller]

How can I use the pam_smbpass module to sync unix passwd with smbpasswd?

Here's the details:
I'm using both passwd and smbpasswd.  When passwords are changed with
smbpasswd, passwd is sync'd.  I would like it so when passwds are changed
with passwd, smbpasswd is sync'd if-and-only-if a user exists in
smbpasswd.  (Not all unix accounts have access to samba).