No. Samba supports SMB1, SMB2 and SMB3.
One can configure the Samba server to set the min/max smb protocol. 
Till 4.11, SMB1 is enabled by default unless otherwise configured differently in smb conf file. 
https://wiki.samba.org/index.php/Samba_4.11_Features_added/changed#SMB1_is_disabled_by_default------------------------------
Ayappan P
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                                                Original Message:
Sent: Mon October 19, 2020 09:26 AM
From: Vijay Maddina
Subject: Samba Version 4.12
Hi,
Does samba solution rely on SBMv1?
This question is for AIX systems. Please someone reply as customer want to know answer.
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Vijay Maddina
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#AIXOpenSource