Did 3D Grid Refinement is Implemented?

In User Guid Release 1.0 r1, Jul 05,2019 . Author said that “At this point, only 2D grid refinement is implemented.”
How about now?

Dear Illyasviel,

The user guide is not up-to-date. The 3D grid refinement is now implemented, have a look at the example in repository examples/showCases/gridRefinement3d