AllParents is the equivalent of AllPackages but for parent requirements of a child requirement.
You can use it to find all requirements that belong to a parent requirement, or any child of that requirement.
To query against just the immediate parent of a requirement, rather then a parent and any of its parents etc. - then use Parent field instead.
All requirements belonging to any parent requirement with a name that contains the word reports:
All requirements belonging to any parent requirement with a name that contains the word "Reports", or a description that contains the words "reporting" or "engine" within project "Project X":