Stream Explorer will show you the number of streams in each file as they are listed per folder.
When you select a directory entry, Stream Explorer will list all the streams in that entry, and you can see their type, their size and contents. The unnamed stream is shown as .
This new version 1.0.3 will show streams in folders as well, with thanks to Jürgen Gärtner for pointing out that folders can also contain streams.
Stream Explorer is freeware.