[CMake] Multiple folder depths in VS projects

[Jon W]

Is there a way to have more than one level of folders in Visual Studio projects?

For example, within the Solution Explorer have Dir1 and Dir2 under the
Source Files folder:

-----------------------------------
Solution 'foo'
   - foo
      - Source Files
          +  Dir1
          +  Dir2
     + Header Files
-----------------------------------

Thanks,
Jon