更改我的BFS，以便它将返回所有目标路径，并且这些路径处于相同的最小级别

from collections import deque

def modify_bfs(graph, start, targets):
    queue = deque()
    queue.append(start)
    parents = {start: []}
    paths = []
    level = 0

    while queue:
        node = queue.popleft()

        if node in targets:
            paths.append(parents[node] + [node])

        for neighbor in graph[node]:
            if neighbor not in parents:
                queue.append(neighbor)
                parents[neighbor] = parents[node] + [node]

        if len(queue) > 0 and len(parents[node]) < len(parents[queue[0]]):
            parents = {queue[0]: parents[queue[0]]}

    return paths

graph = {
    'A': ['B', 'C'],
    'B': ['D', 'E'],
    'C': ['F'],
    'D': [],
    'E': ['F'],
    'F': []
}

start = 'A'
targets = ['D', 'F']

result = modify_bfs(graph, start, targets)
print(result)

[['A', 'B', 'D'], ['A', 'C', 'F']]