.prettierignore not picked up when not in root folder

The following folder structure works for the .prettierrc, but the .prettierignore does not apply. Do I need to move the prettier settings to the root of the project? Because this would mean a discrepancy between eslint & prettier. When placed in subfolders, .eslintignore works as expected.

Folder stucture:

- projectdir
  - sub_project1
    - .prittierrc
    - .prittierignore
  - sub_projec2
    - ...
  - sub_projec3
    - ...

The .prettierrc file:

{
  "singleQuote": true,
  "trailingComma": "all"
}

The .prettierignore file:

# Ignore everything, just to test
**/*
*
**

[dguo]

Here is the relevant Prettier issue: https://github.com/prettier/prettier/issues/4081

[CiGit]

We would implement that if prettier implements it 😃