NewWatcher creates new Watcher that will be watching passed files or directories that already exist.

Usage collects fs usage for specific location, often a directory.

OpCreate is used when watched file was created.

OpRemove is used when watched file was removed.

OpUnsupported stands for currently unsupported file operation type.

UsageInfo holds metrics on fs usage.

Watcher is a filesystem watcher that can be used to watch filesystem changes.

WatchEvent is a single event that happens during filesystem watch.

Op is a separate type for watch file events.