It may work on smaller files, but the protocol itself was not designed for streaming. i doubt it's " great " on any platform,
I suggested to add this option in next app version of home theater. And I streaming 4k files in Plex for kodi.
i doubt they will add FTP for that, FTP ITS NOT MADE FOR STREAMING MEDIA. use samba or NFS for local, even if you need internet streaming there are other that work better than FTP