New is the constructor for FS.

Flags sets the flags based on package "os" flag values.

WithLock locks the file and attempts to keep it locked until the file is closed.

WithTransferManager allows you to provide one of azblob's TransferManagers or your own TransferManager for controlling file writes.

File implements io.FS.File and io.Writer for blobs.

FS implements io/fs.FS.

Sys is returned on a FileInfo.Sys() call.