xpath constraint relation in reference set select page

My domain is currently like this :  Company 1- many Account. ( 1 company has many accounts, 1 account only belong to 1 company ) Project many – many Account ( 1 project may has many accounts, 1 account may take care of many project ) To select which Account is associate with which Project, I am using a Reference Set selector in Project_NewEdit page. In the select page, I use xpath to retrieve an account list with required roles. Now I want to add xpath to only show account that belong to same company as the project owner/creator. Is there anyway to do this via xpath?  I try using microflow instead of xpath but then the select button will become unavailable.