[Samba] unix password sync still missing in samba 4.2?

[d tbsky]

hi:
     I check samba 4.2 man page before upgrading. but after testing
this function is still missing.
will samba 4.x finish this function in someday?

    btw, if I want to make this function myself, any suggestion what
samba source file to check/modify?

    thanks a lot for help!!

Regards,
tbskyd