How to play all music in a folder?

I have all my music in a NAS (// Is there a way to play a folder?
The following luup code only plays one song.

luup.call_action(“urn:micasaverde-com:serviceId:Sonos1”, “PlayURI”,
{URIToPlay=“x-file-cifs://”, Volume=60},

If you have a m3u playlist file containing all the files of your folder, I think you can use this m3u file in the command.