kqueue: only need to store flags on directories
kqueue: only need to store flags on directories

jsix/fsnotify,fsnotify/fsnotify,treejames/fsnotify,omeid/fsnotify,fsnotify/fsnotify,beni55/fsnotify,fsnotify/fsnotify,qida/fsnotify,mingshun/fsnotify,scalingdata/fsnotify-v1