It will only show you one layer down. It shows parts, but not the drawings of those parts. It shows sub-assmblies, but not the parts/assemblies included in that sub-assembly.
I'm not sure if that is exactly what you are looking for, but it is the closest thing I am aware of. .
You might have the option to do the Pack and Go with a right click on the file in Windows Explorer (depending on what version of SOLIDWORKS is installed and what options of that install). You would not have to open the file in SOLIDWORKS using this method.
In solidworks, select File, Open.
(single) Click on the file.
Click the "References" button.
It will only show you one layer down. It shows parts, but not the drawings of those parts. It shows sub-assmblies, but not the parts/assemblies included in that sub-assembly.
I'm not sure if that is exactly what you are looking for, but it is the closest thing I am aware of. .