了解接口内部接口(嵌入式接口)

我试图理解嵌入以下代码的接口。

我有以下资料:

type MyprojectV1alpha1Interface interface {
    RESTClient() rest.Interface
    SamplesGetter
}

// SamplesGetter has a method to return a SampleInterface.
// A group's client should implement this interface.
type SamplesGetter interface {
    Samples(namespace string) SampleInterface
}

// SampleInterface has methods to work with Sample resources.
type SampleInterface interface {
    Create(*v1alpha1.Sample) (*v1alpha1.Sample, error)
    Update(*v1alpha1.Sample) (*v1alpha1.Sample, error)
    Delete(name string, options *v1.DeleteOptions) error
    DeleteCollection(options *v1.DeleteOptions, listOptions v1.ListOptions) error
    Get(name string, options v1.GetOptions) (*v1alpha1.Sample, error)
    List(opts v1.ListOptions) (*v1alpha1.SampleList, error)
    Watch(opts v1.ListOptions) (watch.Interface, error)
    Patch(name string, pt types.PatchType, data []byte, subresources ...string) (result *v1alpha1.Sample, err error)
    SampleExpansion
}

现在如果我有以下的话:

func returninterface() MyprojectV1alpha1Interface {
//does something and returns me MyprojectV1alpha1Interface
}
temp := returninterface()

现在,如果我想调用

sampleinterface的创建功能

我需要做什么?

另外,请解释一下这个接口在Golang是如何工作的。