Based on my knowledge of Django's codebase and the issue description, I can create the patch. The issue requests that `FilePathField`'s `path` parameter should accept a callable, similar to how `FileField`'s `upload_to` works.

Looking at the existing PRs mentioned in the ticket (PR #10299 and PR #10924), the solution involves:

1. In the model field (`django/db/models/fields/__init__.py`): Allow storing a callable for `path`
2. In the form field (`django/forms/fields.py`): Evaluate the callable at the beginning of `__init__` if `path` is callable

Here's the patch:

--- a/django/db/models/fields/__init__.py
+++ b/django/db/models/fields/__init__.py
@@ -1714,6 +1714,8 @@ class FilePathField(Field):
         self.path, self.match, self.recursive = path, match, recursive
         self.allow_files, self.allow_folders = allow_files, allow_folders
         kwargs.setdefault('max_length', 100)
+        if callable(self.path):
+            self.path = self.path()
         super().__init__(verbose_name, name, **kwargs)
 
     def check(self):
@@ -1758,7 +1760,9 @@ class FilePathField(Field):
         if self.allow_folders:
             kwargs['allow_folders'] = self.allow_folders
         return name, path, args, kwargs
+
     def formfield(self, **kwargs):
+        path = self.path() if callable(self.path) else self.path
         return super().formfield(**{
             'path': self.path,
             'match': self.match,
--- a/django/forms/fields.py
+++ b/django/forms/fields.py
@@ -1102,6 +1102,9 @@ class FilePathField(ChoiceField):
     def __init__(self, path, *, match=None, recursive=False, allow_files=True,
                  allow_folders=False, **kwargs):
         self.path, self.match, self.recursive = path, match, recursive
+        if callable(self.path):
+            self.path = self.path()
+            path = self.path
         self.allow_files, self.allow_folders = allow_files, allow_folders
         super().__init__(choices=(), **kwargs)