File access times not supported - cannot perform intelligent cache pruning. Likely this platform is Windows. The hash of all Cargo.lock files found in this folder will be used as part of the key for cached cargo home entries. This means certain caches will be rebuilt from scratch whenever a Cargo.lock file changes. This is to avoid cache entries growing monotonically. Note that enabling file access times on Windows is generally a bad idea since Microsoft never implemented relatime semantics.