Here the official mailing list mirror link:
https://lore.kernel.org/lkml/CAH2r5msoKV7qAgoKipa+QNDJ+xR83Y...
We shipped ksmbd a few months ago to a few million users. We had to iron out a few bugs, but otherwise it works really well (it supports SMBv3.1.1 and is faster than samba).