parallel(maxDescriptors:)
Allow for one or more directory scans to run at the same time. Removal of files will happen on asynchronous tasks in parallel.
static func parallel(maxDescriptors: Int) throws -> RemovalStrategy
Setting maxDescriptors
to 1, will limit the speed of directory discovery. Deletion of files within that directory will run in parallel, but discovery of subdirectories will be limited to one at a time.