You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: mount.go
    path of file: ./repos/sealer/vendor/github.com/ipfs/go-datastore/mount
    
    the code of the file until where you have to start completion: // Package mount provides a Datastore that has other Datastores
// mounted at various key prefixes and is threads
    
func (d *Datastore) Get(ctx context.Context, key ds.Key) (value []byte, err error) {
	cds, _, k := d.lookup(key)
	if cds == nil {
		return nil, ds.ErrNotFound
	}
	return cds.Get(ctx, k)
}