*/
public class FilteredTrackingMerkleDirectorySnapshotBuilder implements DirectorySnapshotBuilder {
    private final Deque<Boolean> isCurrentLevelUnfiltered = new ArrayDeque<>();
    private final Consumer<FileSystemLocationSnapshot> unfilteredSnapshotRecorder;
    private final DirectorySnapshotBuilder delegate;

    private static class PathVisitor extends DirectorySnapshotterStatistics.CollectingFileVisitor {
        private final RelativePathTracker pathTracker = new RelativePathTracker();
        private final FilteredTrackingMerkleDirectorySnapshotBuilder builder;
        private final SnapshottingFilter.DirectoryWalkerPredicate predicate;
        private final AtomicBoolean hasBeenFiltered;
        private final FileHasher hasher;