By e way i bought a multi coated uv filter for $38 and e stop assistant told me i can screw on directly, but after screwed on, i cant do macro shots. camera kept asking me to turn off and on the camera. i would suggest a non multi coated if you are thinking of screwing it on directly without the adapter as the multi coat is affecting the camera focus cos it is screwed on the lens on the opposite direction
The reason is because your X100 lens in macro mode will protrude and require more depth than a single Filter. Either you get two filters remove the one of the glass to act as an extender and screw the second filter or buy the Fuji AR-X100 adapter ring.