Make sure we reject files that are not children of a sync-path

src/main/java/ru/bclib/util/PathUtil.java

@@ -0,0 +1,17 @@
+package ru.bclib.util;
+
+import java.nio.file.Path;
+
+public class PathUtil {
+	public static boolean isChildOf(Path parent, Path child){
+		if (child==null || parent==null) return false;
+		
+		final int pCount = parent.getNameCount();
+		final int cCount = child.getNameCount();
+		
+		if (cCount > pCount) return isChildOf(parent, child.getParent());
+		if (cCount < pCount) return false;
+		
+		return child.equals(parent);
+	}
+}