{tada」は管理者用で、ユーザがtadaなのは間違いない。
ところがパスワードがわからない。

smbpasswdを見ると

root:0:XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX:XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX:[DU         ]:LCT-00000000:
bin:1:XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX:XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX:[DU         ]:LCT-00000000:
daemon:2:XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX:XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX:[DU         ]:LCT-00000000:
adm:3:XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX:XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX:[DU         ]:LCT-00000000:
sync:5:XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX:XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX:[DU         ]:LCT-00000000:
nobody:99:XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX:XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX:[DU         ]:LCT-00000000:
tada:100:B7796BEF19DB5215AAD3B435B51404EE:1CA58AFE951C180005A7B56002E0FF0B:[UX         ]:LCT-447965C0:

お手上げ。