Document loop device support

[yaitskov]

I checked docs and haven't found answer whether ltfs works with Linux loop devices. I don't have a physical tape device.

[vandelvan]

Hello, we would like to know why would you want to use Loop Devices with LTFS?

[piste-jp]

No, LTFS does not support the loop back device, because the loop back device is a kind of emulation of the disk.

But you can use tape emulation on a directory through the file backend. See https://github.com/LinearTapeFileSystem/ltfs/wiki/The-file-backend.