Function best_matching_watch_entry 

pub fn best_matching_watch_entry<'a>(
    path: &Path,
    entries: &'a [WatchPathEntry],
) -> Option<&'a WatchPathEntry>

Find the most specific configured watch entry that contains path.

Matching is path-aware rather than string-prefix-based so sibling paths like /home/user/Pictures and /home/user/Pictures-backup are treated correctly.