The "--filter <file>" parameter does not seem to work

I'm trying to specify a different "filter.xml" file in the command line for "vlt".

The docs seem to imply you can specify a file name:
(from http://docs.adobe.com/docs/en/cq/current/core/how_to/how_to_use_the_vlttool.html#Performing a filtered checkout)

f (-filter) <file> specifies auto filters if none are defined

However, if I try specifying a different file, such as:

> vlt --credentials admin:admin co --filter myFilter.xml --force http://localhost:4502/crx ./app/src/main/content/

The checkout still reads the "filter.xml" file under "./app/src/main/content/META-INF/vault/". I tried placing "myFilter.xml" in the META-INF directory and also the current directory "vlt" is running from, but both did not work.

Is this a bug? If not, what exactly does the "--filter" parameter do? Is there special logic around where the filter files are searched for?

Thank you,
-Leslie