In the Views UI I set up the Relationship "Taxonomy:Parent term"
and then a Field "Taxonomy: Term"
with that relationship.
But the problem is that It displays the parent terms of all the vocabularies (I have several vocabularies).
I also tried the Field "Taxnomy:All terms"
as it can limit the terms by vocabularies but it can't have the Relationship "Taxonomy:Parent term"
Is there any way to display only the parent terms of one certain vocabulary for hierarchical taxonomy in a view field?