How to determine where a bom has been depended(imported) in maven?

I have a project with lots of dependencies. There is a conflicting dependency in my pom, IDEA shows the dependency was imported from a bom that I did't use. I want to exclude it, but I can't find where the bom(not the jar) has been imported. I have tried dependency:tree, it does not show boms, only jars. Is there any way to show where boms have been imported?