Print all file path that file size greater and equal than 
        ``#threshold``.

def show_big_file(dir_path, threshold):
        """Print all file path that file size greater and equal than 
        ``#threshold``.
        """
        fc = FileCollection.from_path_by_size(dir_path, min_size=threshold)
        fc.sort_by("size_on_disk")
        
        lines = list()
        lines.append("Results:")
        for winfile in fc.iterfiles():
            lines.append("  %s - %s" % 
                         (string_SizeInBytes(winfile.size_on_disk), winfile))
        lines.append("Above are files' size greater than %s." % 
              string_SizeInBytes(threshold))
        text = "\n".join(lines)
        print(text)
        with open("__show_big_file__.log", "wb") as f:
            f.write(text.encode("utf-8"))