Items in Reporting Services use / as a path separator, including the root folder. A data source named Example stored in the folder Foo would thus have a path of /Foo/Example.
The module provides a command that works similarly to Get-ChildItem: Get-RsFolderContent (aliased to Get-RsChildItem or rsdir for greater convenience).
To browse the entire structure, simply run the following command:
Get-RsFolderContent -RsFolder "/" -Recurse