how to limit pipelines to a specific folder in a branch

[tamer_saleh]

I have in master branch 4 projects, so I need only the project that have been changed to be pipelined not the whole repo 

[ZenobiusJ]

• https://community.atlassian.com/t5/Bitbucket-questions/Restricting-steps-to-commits-with-certain-file-path-patterns/qaq-p/826126

• https://bitbucket.org/site/master/issues/16560/trigger-pipeline-only-if-certain-files-are