Query for: view users and permissions (roles) from root security folder (MS SQL)

On the Internet I found a lot of scripts how to display users and their permissions under a particular database (Security folder under table) - for example sp_helpuser. Currently, however, I need to use a query to extract users and their permissions from the root of Security folder in Management Studio. Can you please tell me how to extract users and permissions (roles) from this folder using the script? Thank you all in advance for your advice.