samba - Nov 2022 - Rejoin upgrade and remove all traces of Samba

In the rejoin method upgrade path, the doc says "Remove all traces of Samba
from the system".
This means removing config from /etc and everything from /var/lib/samba, right?
For the latter, is deleting all the tdb files enough, or is it better to wipe
away everything inside? My main point is if I can keep sysvol dir (and
eventually other).

thanks

[1]
https://wiki.samba.org/index.php/Upgrading_a_Samba_AD_DC#Rejoining_the_upgraded_DC

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