You just need to add a slash after the path. The only thing that I don't like about this though is sub-folders. You would have to add a specific config to each level of the directories.
Leaving it open, or adding an asterik as the end, will ignore all files in that path.
<handlers>
<add name="NoAccess" verb="*" path="Services/" preCondition="integratedMode" type="Namespace.DirectoryBrowsingAttempt"/>
</handlers>