As usual, your mount folder must also exist.
The important bits are the file system type ("drive filesystem"?) and the fact that you need to enclose the server path in single quotes (on the command line). Nothing too hard, the source path of the mount is the regular UNC pathname. You use mount just as usual: sudo mount -t drvfs '\\server\share' /your/mount/folder Mounting an SMB server share should be straightforward, I tested this on Windows build 1909 and WSL 2.0 Ubuntu 20.04.1 LTS (GNU/Linux 4.19.128-microsoft-standard x86_64).