Need to query or act upon the statuses of subtasks

[David]

We have a project in which parent tasks contain subtasks, and we'd like to be able to indicate when all the subtasks of a task are Done.  

This could either be a filter that has JQL that can query in this manner;

Or, it could be a calculated custom field in the parent issue that becomes True if all the subtasks of that parent are Done. 

Ideally, we would be able to do either of these operations.

Looking for suggested add-ons that someone knows can do this.

Thanks

[Vasiliy Zverev]

All subtasks could be found like this:

 issuetype in subTaskIssueTypes() and resolution is empty

To get it parents you could use: issue in issuesParents(" issuetype in subTaskIssueTypes() and resolution is empty")

IssueParents provided by AM Utils plugin: https://marketplace.atlassian.com/plugins/ru.andreymarkelov.atlas.plugins.utils/server/overview