ContainerDirectory:
    /var/lib/containers/storage/overlay-containers/dcbb459726ad30024e946dc1b17ca60e55697da92c27cf78872c28aa287f1414

    layer store创建的writable layer：
    /var/lib/containers/storage/overlay/fe421c3f765f29b8a084b034bb9e932e07986f83a0b9bf96c3cf392c3d6fbd75/

    overlay home：
    /var/lib/containers/storage/overlay
    包含

    1. overlay-layers里解压出来的数据
    2. 包含创建出来的writable layer