<?xml version="1.0" encoding="utf-8"?>
<navigation xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    android:id="@+id/nav_home"
    app:startDestination="@id/nav_posts">

    <include app:graph="@navigation/nav_posts" />
    <include app:graph="@navigation/nav_users" />
</navigation>

////////////

<?xml version="1.0" encoding="utf-8"?>
<navigation xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:id="@+id/nav_posts"
    app:startDestination="@id/postsFragment">

    <fragment
        android:id="@+id/postsFragment"
        android:name="com.feature_posts.list.PostsFragment"
        android:label="posts_fragment"
        tools:layout="@layout/posts_fragment" >
        <action
            android:id="@+id/action_postsFragment_to_postFragment"
            app:destination="@id/postFragment"
            app:popUpTo="@id/postsFragment" />
    </fragment>
    <fragment
        android:id="@+id/postFragment"
        android:name="com.feature_posts.info.PostFragment"
        android:label="post_fragment"
        tools:layout="@layout/post_fragment" />
</navigation>