The MX development team has released MX-21.1 with Debian 11.3 as a base OS, along with this rollout, they have improved system stability with a newer version of the preinstalled package. Out of the box, you will find the samba-config utility to configure SAMBA/CIFS user shares in a desktop-agnostic way.

Source: LXer – MX-21.1 “Wildflower” based on Debian 11 without systemd support