A multi-module parent POM declares the following BOM import:
io.s
According to How do I show the Maven POM hierarchy? it looks like it not possible with a simple command.
You should write your own plugin or script to climb the hierarchy to the top and find the artifact you are interested in.
Small Tip: to retrieve the version of an artifact you're using, you can open the pom.xml in the Idea Editor and hold Ctrl while hovering on the artifactId, and the full name of its pom will be displayed, with its version.