[Feature-Request]Continuously scan dir/scan dir on boot/ scan dir excluding folder

First and foremost consider this:

#- Only RetroArch bugs should be filed here. Not core bugs or game bugs
#- This is not a forum or a help section, this is strictly developer oriented

Description

[Description of the bug]

Expected behavior

[What you expected to happen]

Continuously scan dir/scan dir on boot/ scan dir excluding folder.
Is there anyway to have Retro Arch continuously scan a dir for new roms? Is there anyway to exclude certain sub-directories?
For example my dir is B:\Games\Emulation it has the games sorted by platform, it had additional emulators and retroarch as subdirs, so I want to exclude the emulator/retro arch dirs and only include the game dirs.

[What is actually happening]

Steps to reproduce the bug

1. [First step]
2. [Second step]
3. [and so on...]

Bisect Results

[Try to bisect and tell us when this started happening]

Version/Commit

You can find this information under Information/System Information

• RetroArch: [version/commit]

Environment information

• OS: [The operating system you're running]
• Compiler: [In case you are running local builds]

The issue names no source files, tests, version, or concrete reproduction steps. Start by clarifying the desired boot-time and continuous scanning behavior and the rules for excluding subdirectories, then locate RetroArch's directory-scanning entry point; done should include agreed behavior and coverage for both scanning and exclusions.