Rust: Borrowed vs owned in as_, to_ and into_

When you read the rust documentation about ad-hoc conversions, you see notations as borrowed -> borrowed, owned -> owned etc. What does that mean? I know the words, but how does it translate into rust? I have some questions, and i want to use this blogging platform to ask some questions.
Multistage docker is sharing intermediate images

When building an image we with a multistage Dockerfile, it uses the intermediate images even when you build multiple images over a pass of multiple docker build commands