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67d34a1
(Get the code!)
The observed sitution is not a bug but expected behaviour.
Nowadays, a samba client does not send the clear-text password but a hash value to the server. Thus, the server has no access to the password and cannot add it to the keyring.
The same applies to the sudo case: a 'sudo' caller uses his own password, not the one of the target user. Therefore the password is not known and cannot be added to the keyring. That's a difference to `su` which requires the password of the target user.
More detailed explanations can be found as answer to the question posted above.