depth() don't work correct

**Describe the bug**
When path() is the root of a windows driveletter, depth(0) is not restricted to the root. It will also find files in the first directory level.

**To Reproduce**
Steps to reproduce the behaviour:
`const files = FileHound.create()
  .path('z:\\')
  .depth(0)  
  .find();`

**Expected behaviour**
Files are also detected in the first level of subdirectories.
