Function scan_entry 

pub fn scan_entry(
    path: &Path,
    config: &ScanConfig,
    token: CancellationToken,
) -> Result<Option<ScannedEntry>, ScanError>

Scan the entry at path as config measures it: a directory with everything below it, or anything else on its own. None if path no longer exists. config.root is ignored.

Hard links are counted once within the entry; links shared with the rest of a tree it is grafted into are not known here.