If you have problems connecting your Mac with MacOS 11.3 via SMB to your FritzBox:
Create a file /etc/nsmb.conf with the content below
Now use the finder to connect with "smb://<hostname>".
This worked for me without restarting Samba.
If you need to restart Samba:
launchctl stop org.samba.smbd
launchctl start org.samba.smbd
With friendly reference to
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