How To Get The Folder Wise Security Info Of All The Users?

Hi,
The Report Manager portal has many folders. For each folder there are specific users with different roles.
I am trying to figure out the way to extract User, folder wise security data. I want to run a query and retrieve users name, the folders they have access to and the user role corresponding to that folder.

Use ReportServer

SELECT u.UserName, r.RoleName FROM users u, policyuserrole pur, roles r

WHERE pur.UserID=u.UserID AND pur.RoleID=r.RoleID
The above query fetches all the users and their roles.
The folder information corresponds to Path column of Catalog table. Am unable link this table with the above query.
TIA