In passdb backend, the account can be called root or Administrator. If root is not called Administrator, then it is good policy to add in smb.conf [globals]:
username map = /etc/samba/smbusers
Then in /etc/samba/smbusers:
root = Administrator
This effectively means that Windows administration can use the Administrator account, while it is in fact 'root'.
Nice, it works like a charm :)
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