[Bug 276602] [fusefs]: invalid value for st_birthtime.tv_nsec

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=276602

            Bug ID: 276602
           Summary: [fusefs]: invalid value for st_birthtime.tv_nsec
           Product: Base System
           Version: 15.0-CURRENT
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Many People
          Priority: ---
         Component: kern
          Assignee: bugs@FreeBSD.org
          Reporter: asomers@FreeBSD.org

If a file system's on-disk format does not support st_birthtime, it isn't clear
what value it should return in stat(2).  Neither our man page nor the OpenGroup
specifies.  But our convention is to return { .tv_sec = -1, .tv_nsec = 0 }. 
fusefs is different.  It returns { .tv_sec = -1, .tv_nsec = -1 }.  It's done
that ever since the initial import in SVN r241519.

Most software apparently handles this just fine.  It must, because we've had no
complaints.  But the Rust standard library will panic when reading such a
timestamp during std::fs::metadata, even if the caller doesn't care about that
particular value.  That's a bug, and should be fixed.  But we can help out by
never returning such values.

https://github.com/rust-lang/rust/issues/108277

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