WPF RichTextBox - Parent element from caret position

Consider this document structure:

<FlowDocument><Paragraph>loreM Ipsum</Paragraph></FlowDocument>

And my caret position is between 'M' and 'I' in the RichTextBox. How can I get the parent element from caret position? In this cas开发者_如何学JAVAe the parent would be the Paragraph.

RichTextBox.CaretPosition.Parent

I think the parent element in that case will actually be a Run, and the parent of the Run will be the Paragraph.