If you’re trying to access a Windows Server 2008 R2 (it’s probably the same with older/newer versions) file share with your Mac and you’re seeing this error:
The folder Documents can’t be open because you don’t have permission to see its contents.
then check whether this problem occurs only if you’re trying to use column view or Cover Flow. (You might have to reconnect a few times to learn how to trigger it reliably.) If so, you might be missing the “Execute” permission – apparently “Read” is not sufficient.