Azure DevOps Pipeline - Checkout only folder

Question

I have a YAML pipeline file with the below code:

trigger: 
  - none

pool:
  vmImage: ubuntu-latest

resources:
  repositories:
  - repository: SubFolder1
    type: git
    name: MyRepo

Here's the repo/folder structure:

MyRepo:
- SubFolder1
  -- SubFolder1-2
  -- SubFolder1-2
- SubFolder2
- SubFolder3
File1.txt
file1.json

What I need to do is to checkout only the subfolder "Folder1" (along with subfolders under it) from the repo called "MyRepo". However, the above cold still checkout the entire MyRepo with all the files and other folders underneath it. Am I doing something wrong?

Thanks