Inserting name of 'parent' document; or Why doesn't GetField work?

I need to insert the title of the parent document in the current document.

I tried using the GetField snippet, but I can’t get it to work at all. I created the snippet, and copied the .inc.php to
[tt]/assets/snippets/getfield/getfield.inc.php[/tt]

But when I call it, it returns nothing. I don’t even know how to troubleshoot it.

Calling it with
[tt][!GetField? &parent=`1`!][/tt]

Also tried
[tt][[GetField? &parent=`1`]][/tt]

How do I solve this? Is there an alternative to getField?

did you resd how it works?

you need to set the docid and the field you want to get, so no parent=`1` but &docid=`[*parent*]` and &field=`pagetitle`