HasNoParentFolder
This template tag was added in version 6.0.4.
This conditional tag detects when the current folder has no parent folder, meaning it is a top level folder.
Example
<mt:Folders>
<mt:HasNoParentFolder>
<mt:FolderLabel> no parent folder exists here
<mt:else>
<mt:FolderLabel> parent folder exists here
</mt:HasNoParentFolder>
</mt:Folders>