samba 4.20.7 (The header files)
Source: https://download.samba.org/pub/samba/stable/samba-4.20.7.tar.gz

Samba is an open-source implementation of the Common Internet File System
(CIFS) protocol used for file and printer sharing by PCs running Windows.
In effect, Samba enables a Linux or Unix server to function as a file server
for client PCs running Windows software.
For german users: http://samba.sernet.de

A running eiskernel 5.1.0 or newer is stronly advised.