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: init.go
    path of file: ./repos/docker-ce/components/engine/vendor/github.com/containerd/containerd/rootfs
    
    the code of the file until where you have to start completion: /*
   Copyright The containerd Authors.

   Licensed under the Apache License, Version 2.0 (the "License");
   you may not use this file except in compliance with the License.
   You may obtain a copy of the License at

       http://www.apache.org/licenses/LICENSE-2.0

  
    
func InitRootFS(ctx context.Context, name string, parent digest.Digest, readonly bool, snapshotter snapshots.Snapshotter, mounter Mounter) ([]mount.Mount, error) {
	_, err := snapshotter.Stat(ctx, name)
	if err == nil {
		return nil, errors.Errorf("rootfs already exists")
	}
	// TODO: ensure not exist error once added to snapshot package

	parentS := parent.String()

	initName := defaultInitializer
	initFn := initializers[initName]
	if initFn != nil {
		parentS, err = createInitLayer(ctx, parentS, initName, initFn, snapshotter, mounter)
		if err != nil {
			return nil, err
		}
	}

	if readonly {
		return snapshotter.View(ctx, name, parentS)
	}

	return snapshotter.Prepare(ctx, name, parentS)
}