>>4474949
You can adapt any lens as long as its flange distance is longer than that of your camera's mount.
The X mount has a longer flange but only by about a millimeter or two, so the adapter is very, very flat (pic rel)

Same reason you can adapt practically any DSLR lens on mirrorless but not the other way around. The only unknown will be the autofocus.
For X mount lenses you have to keep in mind that fuji makes them for APS-C.