Given a hierarchical file system with inherited and overridden permissions, write a function to determine whether a user has access to a file at a specific time.

"I got into ElevenLabs through a connection and the whole process moved pretty fast, about two weeks end to end. My loop was recruiter screen, a timed coding assessment, a live coding interview in a Google Doc, a customer-style case study, and then a CTO/founder interview. The consistent theme was that they wanted strong individuals, not people who hide behind team language, and they mixed behavioral questions into basically every round. The coding and case rounds were on the harder, more signal-driven side, while the founder round felt a bit off-topic and oddly fuzzy about the actual role definition. I passed the interviews and got a verbal yes, but I ended up not getting the final offer."