const golang.org/x/sys/unix.FAN_MNT_DETACH

one use

	golang.org/x/sys/unix (current package)
		zerrors_linux.go#L1242: 	FAN_MNT_DETACH                              = 0x2000000

The pages are generated with Golds v0.7.6. (GOOS=linux GOARCH=amd64)