Based on such arguments, I got an impression that screen saver and locking functionality is handled in wayland protocol, but when I tried to look it up, I haven

Based on such arguments, I got an impression that screen saver and locking functionality is handled in wayland protocol, but when I tried to look it up, I haven't found it. It seems that wayland architecture can solve this only when a compositor directly contains screen locking code. And it also means that every wayland compositor have to do this separately (btw is there any reusable library covering this functionality?) and that independent wayland screen lockers (such as swaylocker) have the same problem as X server implementations.