About: FZF and: AG Search Paths

- [x] I have fzf 0.30.0 or above
- [x] I have read through https://github.com/junegunn/fzf.vim/blob/master/README.md
- [x] I have read through https://github.com/junegunn/fzf/blob/master/README-VIM.md
- [x] I have read through the manual page of fzf (`man fzf`)
- [x] I have searched through the existing issues

I have a code project named test under the $HOME path. The code structure is as follows

:~/test$ tree
.
├── a
│   ├── 1.c
│   ├── 2.c
│   └── c
│   └── 3.c
└── b
├── 4.c
└── 5.c

// I open the 1.c file
:~/test$ vi a/1.c

At this point :FZF can find 4. c and 5. c
:AG can match the content I want in 4. c and 5. c

However, once the project becomes huge and files become numerous,:FZF and :AG can only detect the same level directory of the opened files, and files in the outer directory cannot be detected

Can someone tell me what the reason is and what solutions are available Thank you.