[boost] [filesystem] recursive_directory_iterator::pop() question

Hi, recursive iterator in the Boost Filesystem library has a function pop() which allows to break iteration over current level directory. But at the same time, recursive iterator doesn't seem to give any guarantees about the order of iteration regarding files and directories. But without such guarantees pop() seems to be pretty useless. What I'm missing? Is there any valid use case for recursive_directory_iterator::pop() at all?