improve find performance
improve find performance

use walkOnGoRoutine in any directory instead of root

Signed-off-by: Tw <9badae619f85d6141021d55221ac5bc6f13849e6@gmail.com>

cmars/tools,thomasf/the_platinum_searcher,yuya-takeyama/the_platinum_searcher,cmars/tools,DaSea/the_platinum_searcher,cmars/tools,aeruder/the_platinum_searcher,cmars/tools,tw4452852/the_platinum_searcher,monochromegane/the_platinum_searcher