You can start with a higher-level discussion, such as this:

"Tell me about a time when your team's site/service went down at a critical time (like 10am Monday morning, or maybe it got "slashdotted" on launch day), how you determined the root cause, and how service was restored."

Lots of people are good at BSing such discussions. It's a lot harder to BS with code. Why waste time with a coarse filter when I can start immediately with the fine filter?