This call will return synchronously. This holds true even for folder moves when
the folder contains a large number of items in all of its descendants. For very
large folders, this means the call could take minutes or hours to complete and
some parts of the tree are locked during moves.
When moving a folder, part of the file tree will be locked, mainly
the source folder and all of its descendants, as well as the destination
For the duration of the move, no other move, copy, delete, or restore
operation can performed on any of the locked folders.