Multi-thread with java.nio without file.walk

I was following this tutorial and I was wondering if there is a way to multithread the Files.walkFileTree() function?:

https://docs.oracle.com/javase/tutorial/essential/io/walk.html

this isn't a duplicate because I could use files.walk() but the issue with file.walk() is that it failed when there is a AccessDeniedException.

I want to use walkFileTree because of visitFileFailed() function in SimpleFileVisitor class.