With NUnit, in TearDown, how to get, whether the test was run solo?

So, in TearDown, I have got the info about the test outcome and the test result message, but I would like to handle things specifically on whether the test was run solo (a single test in the test session) or was started in a whole set of tests (e.g. "Run all tests/All tests from Solution").

How to get info about the test run/session in the TearDown method?