How to get list of child files/directories having parent DataLakeDirectoryClient class instance

Hello All!

I have to scan whole data lake file system. Having code like:
PagedIterable<PathItem> pItems = ((DataLakeFileSystemClient)prmParent).listPaths();
for( PathItem pItem : pItems ){
if pItem.isDirectory() ){
((DataLakeFileSystemClient)prmParent).getDirectoryClient(pItem.getName());
} else {
((DataLakeFileSystemClient)prmParent).getFileClient(pItem.getName());
}
}
I get top level dirs/files. But to drill down there must be method listChild() in DataLakeDirectoryClient class.
But i did not find anything similar.
Does anybody know what is the proper way to walk thru the tree?

Thanks. Sergiy