KYF stone [????- ]

We came across this when we descended from PB111, after passing a small cemetery, it's the junction of a path and the road leading downhill to the public lavatory of Nam Pin Wai. 

Before going down, we went up a little bit for the gate of a farm, before reaching it, this stone caught my eye on the right of the dirt track.

Anyone know what the inscription means? I am wondering if it's just the boundary stone of the farm nearby, with only its rusted gate left ... as can be seen here in this Google map link:

香港, 新界南邊圍

https://maps.app.goo.gl/Rc6uJeo7i8pk7En3A

IMG_20201106_KYFStone.jpg, by H.Lo