Well, before I answer that question, I want to tell you that the VTune analyer does not support callgraphing a kernel module or driver. Only user-mode modules can be callgraphed.
There are several ways to specify the instrumentation level. The first is using the global options, available for the command-line interface and the vtlec eclipse-based interface. Secondly, after running a callgraph, you can individually set the instrumentation level for each module by modifying the activity configuration and configuring the collector.