DataFeedParentContainer

This describes what type of parent the feed item is contained in. Most commonly this will be a community, but if the item is not within a community, it may refer to the user that posted a blog, the discussion that the message was posted in, or the standalone library that the document lives in. The ContainerType should give you enough info for which type the item is contained in.

Name	Description	Type	Additional information
ContainerKey	Key related specifically to the container that the feed item is contained in. ex: CommunityKey	globally unique identifier	None.
ContainerName	Name of the container that the feed item is contained in ex: Community name	string	None.
ContainerType	The type of container that the feed item is contained in. ex: Community or Library	string	None.