How to List All Permissions for SQL Server Fixed Database and Server Roles

I am trying to list all current permissions for db_owner and sysadmin for SQL Server 2012. I found these SPs:

EXEC sp_srvrolepermission 'securityadmin' EXEC sp_dbfixedrolepermission 'db_owner' 

However, these are deprecated and only accurate as of SQL Server 2000. Is there an equivalent mechanism to accomplish the same thing today?